ML19308A730

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Supplemental Abnormal Occurrence Rept AO-269/74-12A Re Event on 740806.Describes Further Tests Performed 740819-0901 to Determine Cause of Low Boron Concentration.No Mechanism Identified for Cause of Dilution in Incore Flood Tank
ML19308A730
Person / Time
Site: Oconee 
Issue date: 10/18/1974
From:
DUKE POWER CO.
To:
Shared Package
ML19308A729 List:
References
NUDOCS 7912100562
Download: ML19308A730 (1)


Text

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DUKE POWER COMPANY

$h OCONEE UNIT 1 t

A0-269/74-12A.

SUPPLEME' ITAL ABNOR::AL OCCURRENCE REPO 18, 1974 October Supplemental Reoort Datel August 6, 1974 1

Occorrence Datei Oconee Unit 1, Seneca, South Carolina flood Low boric acid concentration in 1B core Facilitv:

Identification of Occurrenceitank Unit 1 at 100 percent full power

,l Conditions Prior to OccurrenceiAs described in Abno Report 22, 1974 Description of Occurrencel A0-269/74-12 dated August Analysis of Occurrence:

concentration in the IB Core Flood l monitoring program, in addition to Due to an unaccountable decrease in boronTank for O The source, volume, illance, was instituted.

nd the level and pressure of theAn the normal core flood tank <urve and' boron concentration of all makeup acore flood tank dd and af ter each makeup for boron concen September 1, 1974, five addition During the test period, August 19 toborated water were and the hish pressure injection system.

d boron concentrations.the normal species k

were in close agreement with calculateisotopes in the This monitoring program has not aused the dilution of the contents from the high pressure injection system. identified a me of the core flood tank which occurre

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